RBerry, do you have a harness that's supposed to plug into the OEM plug? I spent a whole day looking for mine on my 94 2500 gasser, the sales rep and then the tech from the company I purchased it from told me it was there and look harder. I finally got frustrated and drove to the store and told them to find this supposed plug. It turned out Dodge only supplied one blue wire which was the brake signal. So they returned my money for the adapter harness and I had to run my own wires. BTW, make sure to install a self resetting 30 amp breaker on the positive wire, if you have to install your own.